Hardness-testing machine



" 19 192s.- Jan E. HENKEL HARDNESS TESTING MACHINE Filed Jan. 17, 1923 .Patented Jan. 19, 1926.

UNITED STATES- PATENT OFFICE.

EUGEN HENKEL, 0F FRANKFURT-ON-THE-MAIN. GERMANY, ASSIGNGR T0 METALL- BANK UND METALLUBGISCHE GESELLSCHAFT, AKTIENGESELLSCHAFT, 0F FRANK- FORT-ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

.'HARDNESS-TESTING MACHINE.

Application iil'ed January 17, 1923. Serial No. 613,301.

To all whom t may concern:

vBe it known that I, EUGEN HENKEL, engineer, a citizen of the German Republic, and residing at Rodelheimerlandstrasse 72, Frankfort-on-the-Main, Germany, have invented certain new and useful Improvements in Hardness-Testing Machines, of which the following is aspecification.

The present invention relates to a hardness-testing machine-otl the -Brinell type,

' which contrary to the devices known up to now for this purpose combines the advantages of simple construction with that of great precision of the test results.

To this end the pressure is applied in the known manner by a weight-operated lever and adapted to be slowly and regularlyv transmitted to a die carrying at one of its ends the pressure ball.

According to the present invention the transmission of pressure is effected by the arrangement that the support on which the lever presses when in resting position can be lowered and raised for instance by means of an eccentric. Owing tothe fact that by means of a spring the stamp is pressed continuously against the lever, and that the material to be tested lying on a table c an be adjusted by means of a male screw so as to come into immediate contact with the ball, uniform load of the ball without shocks is obtained as soon as the eccentric upon which thelever rests' is lowered. Thereby most precise results can be obtained. with even such simple" and cheap device.

In the accompanying drawings which show b way of example one form of execution o the invention,

Fig. 1 is affront elevation, artly in section, of a testing machine, and) Fig. '2 is a vertical section through the load transferring mechanism.

On a casing 1 of any construction there is arranged a lever 2 turningvon the edge 4 and provided at one of its ends with the.

weight 3. I The lever is resting on the eccentric 5, whichjmay be operated by means of a second lever 6 and is adapted so as to have in its resting position the full eccentricity above the centrepoint. The die 7 is guided by a shell 8 rigidly connected with the casing. Between the bottom end A of the shell and a collar 9 encircling the die a spring 10 is arranged in such a way as to press the die continuously against the lever arm. The ball 11 is interchangeably con- -nected to the bottom end of the die 7. It

is advisable to also provide the top end of the die in touch with the lever in the same manner with a similar ball 12. The material 13 to be tested lies on the table 14, which by means of the screw spindle 15 can be raised and lowered. By means of a water level 16 the machine can be arranged in such a` way as to give the stamp 7 a vertical posii tion. To. execute the test the table with the material to be tested is raised until the latter comes into Contact with the ball 11.

Thereby care must be taken that the surface l of the material to be tested upon which presses the ball 11 be in a horizontal position. By means of the lever 6 the eccentric 5 isnow given a slow and regular rotation so that the pressure of the weight 3 is transferred to the ball 11 by means of the lever 2 and the stamp 7. lVhen the ball has acted upon the material for a predetermined time, the eccentric is turned back whereby the lever 2 is raised. Simultaneously the spring 10 causes the die 7 to raise whereby the ball '11 is lifted from the depression, thusv releasing the material to betested. The' latter now can be 'removed from-the table to determine the depression and the machine is again ready for use.

To prevent during the testing operation any other movement' of the lever 2 than that prescribed the machine can be fitted with such devices as are known for this purplose.

e pressure to be effected by th ball on` the material can be increasedpr decreased by replacing the weight or by changing the transmission ratio.

What I claim is:

1. In a hardness-testing machine, a d1e, means for guiding said die, a weight-operated lever, and a ball on the upper end of said die for engaging said lever.

2. In a hardness-testingmachine, a dle, means for guiding said die, a weight-operated lever, and a spring urging the upper end of said die towards said lever.

sol

3. In a hardness-testing machine, a die, I

a sleeve for guiding said die vertically, a weight-operated lever, a ball on the upper end of said die, anda spring pressing said ball against said lever.

4. In a hardness-testing machine,'a die, a weight-operated lever, an eccentric for supporting said lever and adapted to be lowered and raised for loading and unloading said die with the pressure of said lever, a ball between said die and lever, and a spring 10 urging said die upwardly.

cIn testimony whereof I aix my signature.

EUGEN HENKEL. 

